Ya, that is definitely excessive. To better diagnose your issue, can you make sure you aren't using any third party services at all (anywhere where you logged in with your Tesla Account outside of the Tesla site or the release phone app). If you have logged in anywhere, please change your Tesla password. Next, stop checking your battery drain for 8 hours at a time, ideally 12. Once you have let the car sit idle for 12 hours, go ahead and check it. See how much drain and report back. Make sure you mention of the car is indoors or outdoors in the sun, and ambient temperature. Also make sure that cabin overheat protection is off, and report back which Firmware version you are on.
A properly functioning TM3 loses anywhere between 0-5 miles / 24h most lose 2-3.
Third party apps like Tezlab and Teslafi have been known to cause excessive drain.
But to answer some of your other questions, i am losing 20-22 miles per day. No, Power Off does not force sleep for me, my issue is the car wakes itself up, so it goes to sleep and will wake up 20 minutes later, eventually go back to sleep and keep waking up.
You can see if your car is sleeping without waking it up by using the widget that comes with the app and not actually starting the app. The widget is the one that is on the IOS lock screen.
